An initial discussion on major controlling factors on formation of coal-formed large-medium gas fields

摘要

the so-called "large-medium gas field" means a gas field with proven reserves equal to or larger than 100 × 10 ~8 m~3. Up to 1997, 23 coal-formed great-medium fields are discovered in China, excluding two in Taiwan Province. Their proven reserves take 50.9/100 in total natural gas Reserves. Therefore, the coal-formed great-medium gas field plays a decisive role in natural gas Reserves and the study of their controlling factors is very important both in theory and in practices.